This is a discussion forum for hosts and guests, not Airbnb customer service.
But I can tell you that Airbnb won't investigate this company just because they mismanaged your place. If their mismanagement resulted in terrible reviews, really low ratings, and lots of guest complaints to customer service, they might have delisted it, but you don't mention if this was the case, just that their incompetence cost you a lot of money.
There isn't anything illegal or against Airbnb policy in a host giving control of their listing to a management company. It was your choice. Most savvy hosts would never do that, but some hosts have also had problems in this regard and I'm sorry that it was a expensive lesson for you.
@Geordon0